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a manhole cover has a diameter of 3 ft. What is the length of the brass grip-strip that enciricles the cover, making it easier to manage?

a manhole cover ha diameter of 3 ft. What is the length of the brass grip-strip that encircles the cover ,making it easier to manage?

Charles C. | Effective Tutor for math, English, science, Coding, Test prepEffective Tutor for math, English, scien...
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The length of the brass grip-strip that encircles the manhole cover is simply the circumference of the circle.
The circumference of a circle is solved by this formula: C = pi * D  (which is the same as 2 * pi * r)
= 3.142 * 3 = 9.426 ft.
So the length is approximately 9.4( when rounded to 1 decimal place)
Antony F. | The one who can get you from an F to an A+ in mathematics!The one who can get you from an F to an ...
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The length of the brass grip-strip that encircles the manhold cover represents the  Circumference C of a circle which is given by the formula   C = pi times (the length of the diameter).   Since the manhold cover has a diameter of 3 ft = 36 in  then its circumference is

C = ∏ × (3 ft) = 3∏ ft ≈ 9.42 ft

The length of the brass grip-strip that encircles the manhold cover approximately  9.42 ft  or exactly 3∏ ft

Billy S. | Elementary subjects, Photography and Technical Subjects TutoringElementary subjects, Photography and Tec...
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This seems like you just want to figure out the circumference of the manhole cover.  The formula for the circumference of a circle is pi (3.14) multiplied by the diameter (d) of the circle so, circumference=πd. (π is the symbol for pi and approx. equals 3.14)

Circumference = πd

= 3.14(d)

= 3.14(3)

= 9.42 ft.

The length of the brass grip-strip will be 9.42 ft.

If the problem was stated in terms of the radius of the manhole cover then the formula would be circumference = 2πr which is the radius multiplied by 2 then multiplied by pi.

The radius of a circle is the distance from the center to the edge and the diameter is the distance from one edge of the circle to the other passing through the center of the circle.

5.0 5.0 (44 lesson ratings) (44)
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I'm no expert on manhole covers. I assume the brass grip-strip runs around the outside edge of the cover. The perimeter of the circular cover is the length of its outside edge. It is also known as its circumference.

Call C the the circumference and D the diameter. The formula that relates the two is:

C = π·D

Pi is a constant that is approximately 3.14159.

C = 3.14·3 ft

C = 9.4 ft

Kerrie T. | math and science from a professional academic scientistmath and science from a professional aca...
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Well, if the grip strip were of no width and could be straightened out to a line (which a piece of rubber cut in a circle couldn't be), then the length of the grip would correspond to the circumference of the manhole cover.

Crystal B. | Never Fear! Math is Here!Never Fear! Math is Here!
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Since the definition of encircle is to form a circle around you are looking for the circumference of the brass grip. Circumference is equal to the diameter * pi. So pi * 3 ft = 9.425 ft. So the circumference is equal to 9.425 ft

Hope that helps!

Kevin S. |
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If the brass strip encircles the cover, then it goes around the outside edge, or the circle's circumference.

The circumference of a circle C = πD or C = 2πr.    (π = pi, or approximately 3.14)

Since the diameter is given, the C = πD = π(3) = 3π or approximately 3(3.14) = 9.42 feet.

Duy N. | IncipientWisdomIncipientWisdom
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Circumference is what you need.

Which happens to be

πD, pi* Diameter

side note* Circumference/Diameter = pi

John R. | John R: Math, Science, and History TeacherJohn R: Math, Science, and History Teach...
4.6 4.6 (55 lesson ratings) (55)
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The length of the brass grip-strap that encircles the cover should be the same as the circumference of the manhole cover.

To find the circumference of the manhole cover, use the formula: Circumference = Pi X diameter

Circumference = 3.14 X 3 ft

Circumference = 9.42 ft

Note that I approximated Pi to 2 decimal places.  You may need to use more or less digits in your answer depending on what your teacher asks for.

*Note, this answer now contains corrections for my boneheaded mistake.  I tried to fix it earlier, question was temporarily removed.